Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters

Ming-zhi GAO; Min CHEN; Cheng JIN; Josep M. GUERRERO; Zhao-ming QIAN

doi:10.1631/jzus.C1200236

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Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters

电气与电子工程 | Updated：2022-12-09

- Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters
- Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters
- 信息与电子工程前沿（英文） 2013年14卷第1期页码：50-64
- Affiliations：
  
  1.Department of Applied Electronics, Zhejiang University, Hangzhou 310027, China
  2.Institute of Energy Technology, Aalborg University, Aalborg 9000, Denmark
- Author bio：
  
  Min CHEN, E-mail: calim@zju.edu.cn
- Funds：
  
  Project (No. 51107116) supported by the National Nature Science Foundation of China
- DOI：10.1631/jzus.C1200236
  中图分类号： TM464
- 收稿：2012-08-08，
  
  修回：2012-12-23，
  
  纸质出版：2013-01
- Accepted：
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Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters[J]. 信息与电子工程前沿（英文）, 2013,14(1):50-64.

Ming-zhi GAO, Min CHEN, Cheng JIN, et al. Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters[J]. Frontiers of Information Technology & Electronic Engineering, 2013, 14(1): 50-64.
Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters[J]. 信息与电子工程前沿（英文）, 2013,14(1):50-64. DOI： 10.1631/jzus.C1200236.

Ming-zhi GAO, Min CHEN, Cheng JIN, et al. Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters[J]. Frontiers of Information Technology & Electronic Engineering, 2013, 14(1): 50-64. DOI： 10.1631/jzus.C1200236.

摘要

Abstract

Parallel operation of distributed generation is an important topic for microgrids

which can provide a highly reliable electric supply service and good power quality to end customers when the utility is unavailable. However

there is a well-known limitation: the power sharing accuracy between distributed generators in a parallel operation. Frequency and voltage droop is a well-established control method for improving power sharing performance. In this method

the active and reactive power calculations are used to adjust the frequency and amplitude of the output voltage. This paper describes the digital implementation of a droop method

and analyzes the influence of power calculation on droop method performance. According to the analysis

the performance of droop control in a digital control system is limited by the accuracy and speed of the power calculation method. We propose an improved power calculation method based on

p-q

theory to improve the performance of the droop control method

and we compare our new method with two traditional power calculation methods. Finally

simulation results and experimental results from a three single-phase 1-kW-inverter system are presented

which validate the performance of our proposed method.

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references

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